How to change the calculation value?

Hello:

I'm trying to change the calculation value to "on" on this form

https://www.jotform.com/build/81714520386153

and when I click on it, the whole page goes blank.

Please advise. 

Myriam

Phillies Bridge Farm Project

I am sorry for the trouble caused to you. I did check your form and and you have added formula in "Total" form calculation widget. Please check the screenshot below:

Do you want to change the value of the total based on the selection of form field? Please explain your requirement a bit more in detail on how to you want to change the calculation of the "Form Calculation" widget and we will try to help you.

We will wait for your response.